These adidas Stadium 3 backpacks are designed for soccer players, this backpack features: Recycled Polyester Material. Zipper bottom ball pocket that can hold a size 5 ball inside or be worn outside in a mesh pocket. Two side mesh pockets hold up to a 32oz water bottle. Water-resistant base material keeps your stuff dry. Zippered pocket with ventilation to air out your dirty gear. Room for embroidery. .